Heater.



G. W. B'THWELL.

HEATER. APPLICATION FILED APB. 24, 1913.

1,116,789. Pandmovmwm.

'UNITED sfrarns nea,rnu'r'` curr-an .GEORGE W. BpfrHwEnL, or ONTARIO, CALIFORNIA. l

HEATER.

Specification of Letters Patent.

l Application led April 24, 19.18. Serial No. 763,438.

' vaporized in a generator before-it is burned,

and the main object of the invention is to provide for preventing backiow of vapor to the supply tank or reservoir without the use of a check valve, and with minimum head or pressure. on the supply of oil.

Another object of the invention to prevent production of undue pressure 4in the generator. l

The accompanying drawings illustrate embodiments. of the invention. and referring thereto:

Figure 1 is a vertical section of the heater, its supply reservoir being shown partly in elevation. .Fig 2 is a horizontal sectionon line azz-?, in Fig. 1. Fig. 3 is a sectional view showing the burner outlet. Fig. 4 is a vertical section of a. modified form of the heater. Fig. is a plan view of the generator and burner tube of the form shown in Fig. 4. Fig. 6 is a section on line ace-fm", in Fig. 4.

Referring to Figs. 1 and 2. the heater shown therein comprises a 'casing'or' pot 1, having a cover 2, provided with a stack 3, said casing being provided at one side with an air inlet opening 4, through which eX- tends the oil or fuel supply pipe 5. A portion of pipe 5 within the casing 1 is formed as a generator or retort said vpipe being bent around, Jfor example, in apl'iroximately circular shape, and terminating in a vapor outlet 7 formed in a cap 8 at the end of the pipe. Said generator portion of the pipe may be bent up, as at 9.y to prevent oil from running out of the generator' when cold.

Oil supply pipe 5 is connected to a pipe generator, Vthe products 10, communicating with a suitable source of 'O11 supply,I for example a. tank or reservoir 11, which'may, as shown, be provided with an outlet chamber communicating with the interior -of the reservoir'by means of an opening 13, and having a vent 14, whereby oil is only allowed to flow into said outlet chamber in sulicient amount to keep the oil level therein at a definite level. Any other suitable means for supplying oil may be used. I prefer to provide a manually operated valve l5, in the oil pipe 10.

Pipe l10 is provided `with a downwardly extending or U-shaped bend 16, forming a Ruisseau? Patentedivwio, ieri.

trap, and a vent pipe 17 leads upwardly from the end of this bend nearer the generator, and is preferably open at the top.

The operation is as follows: Valve 15 being opened, oil flows from tank 11 to the pipes 10 and 5, and ,fire being started in the casing l, by burning light oil or rubbish therein, the generator is heated suiiciently to cause vaporization of the oil in the generator, and the vapor, issuing from the outlet 7, burns in a ame which passes around within the casing and in Contact with the generator, so as to maintain the heat of the of' combustion eventually passing up through the stack. The production of the vapor in the generator develops considerable back pressure,

tending to force oil and-vapor back into the reservoir 11. This tendency is resisted by the down bend 16 in the pipe, and the vapor passing back in pipe 5 escapes upwardly in the vent pipe 17, being mostly condensed in this pipe 17 and fiowmg back into pipe 5. By reason of the described operation-of the trap and vent in the oil supply pipe, I am enabled to use an oil supply having very little pressure, and am enabled to use a horizontally extending generator having little if any rise for retaining the oil. The heater casing may be of any suitable form, for example, and L-shaped tubularv structure of stove pipe, as shown at 24 in Figs. 4 and 6,the generator being in that case an elongated coil 25, having an outlet 26. This figure also Shows a modification ing from said pipe between the trap and the of the trap which is here shown as a circular generator. or helical bend 2'( in the oil pipe 28. In testimony whereof, I have hereunto What I claim 1S: set my hand at Los Angeles, California, this A heater comprising a generator having 17th day of April, 1913. a burner outlet, a supply pipe for liquid fuel, connected to said generator, and provided with a downwardly extending U- shaped bend, acting as a trap for vapor pass- 10 ing from the generator, and a vent pipe lead- GEORGE W. BQTHWELL.

In presence. of-

ARTHUR P. KNIGHT, F. ALICE CRANDALL. 

